In message <
[email protected]>
Alex <
[email protected]> wrote:
>>>I know, I had to take a Landrover rear tub and bonnet back to bare and
>>>respray, as not even 2K etch isolating primer would stick to it
>>>properly.
>>
>>Etching primer is designed for bare metal use, is has no real effect or
>>benefit applied on painted surfaces.
>
>Which is a problem if you have rubbed down and have a mixture of bare
>and painted surfaces.
If you only have relatively small areas of bare metal to etch you can
always refer to the old cotton cloth or rag method of applying acid
etch, you only need to wipe over the metal to create a key for
subsequent coats.
>I still have the bonnet sitting around, I've never seen anything quite
>like it, the primer applied is supposed to do both Etch and Isolate,
>even normal isolating primer won't stick to it either.
An isolator is supposed to sit on top of previous layers without
softening the paint surface underneath, Acid etch or etch primers are
solvent baring paints that use aggressive solvents that will nearly
always cause solvent reactions particularly on unknown paint finishes.
I have a tin of unused isolating etch primer in the garage but it's only
suitable for use as an etch primer, I think the so called isolating
properties mean "isolating bare metal" were there'd be no risk of
solvent reaction.
Acid etch as you probably know is a resoluble solvent product whereas
the traditional isolator or barrier coat is an alcohol non soluble form.
>**** knows what's on it, but I would have had to go completely bare
>metal and start from scratch. I got another bonnet from stock and
>painted that one instead.
Is it possible to apply UPOL's Barcote isolator for example on freshly
painted synthetic finishes without any adverse solvent reaction.
The two products are entirely different paint types with two completely
different uses and IMO should not be confused.
Hope this make some sense?
Steve.
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